So, I've finally dug into Megami Tensei 2 a few days ago. I've patched the game with the latest version (the one that DDStranslation sent me via PM), however I had some problems (ranging from minor to major) which I'm going to list here.
Some demons' stats can get messy.
The Big & Small minigame is missing the background and the timer.
Also related to B&S: some items, such as Magic Source and Metal Card don't appear in my inventory at all.
I've backed up a rom with the previous version of the patch and the missing background problem with B&S seems to be fixed, however I still don't have some items.